hard to wrap my brain around this. . . .

This morning, as I was waiting, at preschool with Victoria, a young dad was waiting with his son and we were visiting when he says, "hey you go to Westside don't you?" he then says he goes there from time to time and that he graduated high school with my son, David. My daughter is going to preschool with my son's friend's son!  Did you get that? am I making sense because. . . .it's really pretty crazy to me!